We are rolling up content from multiple site collections and are looking for a way to allow a RSS feed from that rolled up content. Any ideas on implementation of a RSS option for a custom webpart? I know the Content Query Web Part has an option to subscribe to it via RSS and am looking to implement that on a custom web part.

2 Answers
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I think you'll need an application page (_layouts page) for this that returns the xml needed for the feed. If you've seperated the data/business logic from your presentation layer in your webpart, then this application page should be pretty easy to write because you are just creating a new XML based presentation layer.

Thanks for the additional information and post. I was hoping to keep the logic for querying the data in just the web part. I hadn't thought of using an application page, but I guess I could create a generic one that takes parameters from the web part.
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Jason JonesSep 16 '11 at 15:47